Ontech GSM 9020, Руководство пользователя

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Position of the contacts on the circuit board
Fig 1. Upper side of the circuit board.
Fig 2. Back side of the circuit board. NB The backup battery is optional and not standard.
Installation of internal backup battery
If you want to use an internal backup battery (see page 26) you should install this before
the physical installation. The backup battery is optional and is not included in the
standard package. If you do not install a backup battery, go to section ”Physical
installation” see page 10.
1. Open the unit by unscrew the two screws on the left and right sides.
2. Turn the unit so you face the under side.